Question # 1

The internal energy of an ideal gas system is generally the

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translational K.E of molecules

vibrational K.E of molecules

rotational K.E of molecules

all of them

Efficiency of carnot engine is independent of the

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temperature of sink

temperature of source

nature of the working substances

none of them

Sadi carnot described an ideal heat engine in

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1820

1840

1860

1880

The volume of given mass of a gas will be doubled at atmosphere pressure if the temperature of the gas is changed from 150°C to

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300°C

573°C

600°C

743°C

If an amount of heat enters the system it could

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decrease the internal energy

not change the internal energy

increase the internal energy

none of them

First law of thermodynamics is consequence of conservation of

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Work

Energy

Heat

All of these

While deriving the equation for pressure of a gas we consider the

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rotational motion of molecules

vibrational motion of molecules

linear motion of molecules

all of them

The motion of molecules in gases is:

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Orderly

Random

Circular

All of these

Hotness and coldness of an object is represented in terms:

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Heat

Temperature

Chemical energy

None of these

A typical four stroke petrol engine undergoes how many successive processes in each cycle

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one

two

three

four

Brownian motion increases due to

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Increase in size of Brownian particle

Increase in temperature of medium

Increase in density of medium

Increase in viscosity of medium

The basis to define a temperature scale that is independent of material properties is provided by

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carbon cycle

nitrogen cycle

Carnot cycle

irreversible cycle

A process in which no heat enters or leaves the system is called

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isochoric process

isothermal process

adiabatic process

none of them

The product of the pressure and volume of an ideal gas is

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A constant

Approximately equal to the universal gas constant

Directly proportional to its temperature

Inversely proportional to its temperature

A real gas can be approximated to an ideal gas at

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Low density

High pressure

High density

Low temperature

When two objects come to common temperature, the body is said to be in:

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Static equilibrium

Dynamic equilibrium

Thermal equilibrium

None of these

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ECAT Physics Chapter 11 Heat & Thermodynamics Online Test MCQs With Answers

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